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6,5 = (8 + 20 + 6x + 42 + 24 + 18)/(17 + x)
6,5.(17 + x) = 112 + 6x
110,5 + 6,5x = 112 + 6x
6,5x - 6x = 112 - 110,5
0,5x = 1,5
x = 1,5:0,5
x = 3
Jawaban: A
--------------------------------------------- = 6,5
2+4+x+6+3+2
8+ 20+ 6x +42 + 24 + 18
-------------------------------- = 6,5
17 + x
112 + 6x
----------- = 6,5
17+x
112 + 6x = 6,5 (17 + x)
112 + 6x = 110,5 + 6,5x
112 - 110,5 = 6,5x - 6x
1,5 = 0,5x
1,5 dibagi 0,5 = x
3 = x